Dormancy

From Conservapedia

Dormancy is a state of reduced metabolic activity that many organisms adopt during periods of environmental stress.[1] The stress may be expected (e.g., winter and summer, two common times of dormancy) or unexpected (e.g., drought). Dormancy during winter and summer is called hibernation and aestivation, respectively.

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Hibernation

As noted above, hibernation is a behavior of certain animals, particularly in cold climates, of entering dormancy as a means of coping with the vicissitudes of winter. While many animals will sleep more than usual during the winter, true hibernation involves dramatically reduced heartrates and body temperatures, generally over a single unbroken period of torpor.

Most birdsmigrate to avoid harsh seasonal conditions; the common poorwill, a type of nightjar, is the only bird known to hibernate. Historically, swallows were believed to hibernate at the bottom of ponds.

Aestivation

As noted above, aestivation is a behavior of certain animals, typically in hot climates, involving a period of dormant behaviour to avoid the extremes of summer. It is a rather less common behaviour than hibernation. Animals that aestivate include certain types of crocodile and lungfishes.